Buggy code:
@ SuppressWarnings ( "serial" ) public class VariamosGraphEditor extends BasicGraphEditor { private int modelViewIndex = 0 ; private int modelSubViewIndex = 0 ; private List < String > validElements = null ; private List < MetaView > metaViews = null ; protected DomainRegister domainRegister = new DomainRegister ( ) ; protected GraphTree productLineIndex ; protected ConfiguratorPanel configurator ; protected ConfigurationPropertiesTab configuratorProperties ; protected RefasExpressionPanel expressions ; protected JTextArea messagesArea ; protected JTextArea expressionsArea ; private ElementDesignPanel elementDesignPanel ; protected JPanel elementConfigPropPanel ; protected JPanel elementExpressionPanel ; protected JPanel elementSimPropPanel ; protected PerspectiveToolBar perspectiveToolBar ; protected JTabbedPane extensionTabs ; protected static SemanticPlusSyntax sematicSyntaxObject ; protected int mode = 0 ; private int tabIndex = 0 ; private int lastTabIndex = 0 ; private Refas2Hlcl refas2hlcl ; private VariamosGraphEditor modelEditor ; private EditableElement lastEditableElement ; private boolean recursiveCall = false ; private boolean updateExpressions = true ; private String editableElementType = null ; public Refas2Hlcl getRefas2hlcl ( ) { } public VariamosGraphEditor getEditor ( ) { } public VariamosGraphEditor ( String appTitle , VariamosGraphComponent component , int perspective , AbstractModel abstractModel ) { } public VariamosGraphEditor ( MainFrame frame , VariamosGraphComponent component , int perspective , AbstractModel abstractModel ) { } public SemanticPlusSyntax getSematicSintaxObject ( ) { } public AbstractGraphEditorFunctions getGraphEditorFunctions ( ) { } public void setGraphEditorFunctions ( AbstractGraphEditorFunctions gef ) { } public int getModelViewIndex ( ) { } public int getModelSubViewIndex ( ) { } public List < MetaView > getMetaViews ( ) { } public void setVisibleModel ( int modelIndex , int modelSubIndex ) { } public void updateEditor ( ) { } public void updateView ( ) { } public static VariamosGraphEditor loader ( String appTitle , String file , String perspective ) throws FeatureModelException { } public static SemanticPlusSyntax getSematicSyntaxObject ( ) { } public static void setSematicSyntaxObject ( SemanticPlusSyntax sematicSyntaxObject ) { } public void editModel ( AbstractModel pl ) { } public void resetView ( ) { } private void registerEvents ( ) { } public static String loadShape ( EditorPalette palette , File f ) throws IOException { } public static String addStencilShape ( EditorPalette palette , String nodeXml , String path ) { } @ Override protected Component getLeftComponent ( ) { } @ Override public Component getExtensionsTab ( final EditableElement elm ) { } private void updateVisibleProperties ( final EditableElement elm ) { } public void bringUpExtension ( String name ) { } public void bringUpTab ( String name ) { } public JTextArea getMessagesArea ( ) { } public ConfiguratorPanel getConfigurator ( ) { } public void editModelReset ( ) { } public void populateIndex ( ProductLine pl ) { } public AbstractModel getEditedModel ( ) { } public void editPropertiesRefas ( final EditableElement elm ) { } public void refreshElement ( EditableElement elm ) { } protected void onVariableEdited ( Editable e ) { } protected void onVariableEdited ( EditableElement editableElement , EditableElementAttribute instAttribute ) { } protected void installToolBar ( MainFrame mainFrame , int perspective ) { } public final MainFrame getMainFrame ( ) { } public void refreshPalette ( ) { } public void setModelEditor ( VariamosGraphEditor modelEditor ) { } public void updateObjects ( ) { } public void cleanSimulation ( ) { } public void executeSimulation ( boolean first , int type ) { } public void verifyErrors ( ) { } public void verifyRoot ( ) { try { HlclFactory f = new HlclFactory ( ) ; HlclProgram hlclProgram = refas2hlcl . getHlclProgram ( DESIGN_EXEC ) ; Defect defect = new Defect ( refas2hlcl . rootVerityTest ( ) ) ; defect . setDefectType ( SEMANTIC_SPECIFIC_DEFECT ) ; HlclProgram fixed = new HlclProgram ( ) ; IntCauCosAnalyzer defectsAnalyzer = new CauCosAnayzer ( ) ; Diagnosis result = defectsAnalyzer . getCauCos ( defect , refas2hlcl . rootRelaxedTest ( ) , fixed , COMPLETE ) ; Set < String > outIdentifiers = new TreeSet < String > ( ) ; String defects = "(" ; <START_BUG> for ( CauCos correction : result . getCauses ( ) ) { <END_BUG> List < BooleanExpression > corr = correction . getElements ( ) ; for ( BooleanExpression expression : corr ) { Set < Identifier > iden = HlclUtil . getUsedIdentifiers ( expression ) ; Identifier firsIden = iden . iterator ( ) . next ( ) ; String [ ] o = firsIden . getId ( ) . split ( "_" ) ; if ( outIdentifiers . add ( o [ 0 ] ) ) defects += ( o [ 0 ] ) + ",<seq2seq4repair_space>" ; } } refas2hlcl . updateErrorMark ( outIdentifiers , "Root" , ( ( "More<seq2seq4repair_space>than<seq2seq4repair_space>one<seq2seq4repair_space>root<seq2seq4repair_space>element<seq2seq4repair_space>is<seq2seq4repair_space>not<seq2seq4repair_space>allowed.<seq2seq4repair_space>Delete<seq2seq4repair_space>" + ( ( outIdentifiers . size ( ) ) - 1 ) ) + "<seq2seq4repair_space>from<seq2seq4repair_space>the<seq2seq4repair_space>model" ) ) ; defects = ( defects . substring ( 0 , ( ( defects . length ( ) ) - 2 ) ) ) + ")" ; try { ( ( RefasGraph ) ( getGraphComponent ( ) . getGraph ( ) ) ) . refreshVariable ( lastEditableElement ) ; JOptionPane . showMessageDialog ( frame , ( ( ( ( outIdentifiers . size ( ) ) + "<seq2seq4repair_space>roots<seq2seq4repair_space>identified<seq2seq4repair_space>" ) + defects ) + ".\n<seq2seq4repair_space>Please<seq2seq4repair_space>keep<seq2seq4repair_space>only<seq2seq4repair_space>one<seq2seq4repair_space>of<seq2seq4repair_space>them." ) , "Verification<seq2seq4repair_space>Message" , JOptionPane . INFORMATION_MESSAGE , null ) ; } catch ( Exception e ) { lastEditableElement = null ; JOptionPane . showMessageDialog ( frame , "Please<seq2seq4repair_space>select<seq2seq4repair_space>any<seq2seq4repair_space>element<seq2seq4repair_space>and<seq2seq4repair_space>after<seq2seq4repair_space>execute<seq2seq4repair_space>the<seq2seq4repair_space>verification." , "Verification<seq2seq4repair_space>Message" , JOptionPane . INFORMATION_MESSAGE , null ) ; } if ( ( lastEditableElement ) == null ) JOptionPane . showMessageDialog ( frame , "Please<seq2seq4repair_space>select<seq2seq4repair_space>any<seq2seq4repair_space>element<seq2seq4repair_space>and<seq2seq4repair_space>after<seq2seq4repair_space>execute<seq2seq4repair_space>the<seq2seq4repair_space>verification." , "Verification<seq2seq4repair_space>Message" , JOptionPane . INFORMATION_MESSAGE , null ) ; } catch ( FunctionalException e ) { JOptionPane . showMessageDialog ( frame , e . getMessage ( ) , "Verification<seq2seq4repair_space>Message" , JOptionPane . INFORMATION_MESSAGE , null ) ; } } public void identifyCoreConcepts ( ) { } }

Fix:
for ( CauCos correction : result . getCorrections ( ) ) {